N 70, a cosmic bubble in the LMC

[tornado33]

Hi all
Heres 1 hour 15 mins's worth of imaging on this fascinating bubble nebula N 70 in the LMC. 5x15mins ISO 400, uv/ir and UHC-S filters and MPCC used on 10 inch f5.6 Newtonian, with modded 350D, hand guided. Last exposure finishing just in time for start of astronomical twilight.
Scott

[Astroman (Andrew Wall)]

Nice shot Scott. These are interesting objects that are overlooked by somany, thanks for sharing them with us.

[RB (Andrew)]

That's an awesome shot !

Yes thanks for sharing these with us Scott.

[h0ughy (David)]

Late night Eh, Nice result Mr Alder

[Lester]

Excellent capture there Scott.

[tornado33]

Thanks all
Ive been meaning to get this object for some time, was just a matter of waiting for the LMC to get high enough.
The Astronomy 2006 book is very handy for planning morning imaging sessions between moonset and astronomical twilight.
Scott

[EzyStyles (Eric)]

that is a stunning shot scott and great effort with the hand guiding. is it a big difference with and without the UV/IR filter?

[tornado33]

Thanks Eric.
Without the ir/uv filter there is a brighter background (both red, green and blue pixel elements are transparent to IR light and so pick it up, as a pinkish background glow (probably from streetlights and the like) The sky is definately darker with the filter in place. Perhaps for some galaxies strong in IR light better results may be without the filter, but Ive shot things like NGC 5128 with a IR pass filter in place (visible light blocked) and result was dissapointing. Most emission nebulae emit almost nothing in IR either.
Perhaps also if I was in a very dark sky location better unfiltered results may be possible too.
The UHC-S filter passes some IR light if I dont use the uv/ir filter too
Scott

[EzyStyles (Eric)]

thanks for the explaination. that clarifies it.

[PhotonCollector (Paul)]

Well done Scott,

That's a rather difficult object to locate, but you have found it, and produced a wonderful image.

well done.

Paul M

[Ric]

Great image Scott, what a fascinating looking nebula and great colour as well.

cheers

[Adrian-H]

is this the brain neb one but in h-alpha enhanced with the mod?

[tornado33]

Thanks all
No its a different nebula than the blue one I imaged previously. This one isnt a planetary , but one thought to come from stellar winds by Extreme Ultraviolet photons from hot stars or possibly supernovae in the past.
Info here
http://www.telescope.org/btl/gy4.html
http://www.astro.uni-bonn.de/~mcnews/newsletter31.html
Scott

[ving (David)]

wow! thats cool scott. wish it was actually visible!

[[1ponders] (Paul)]

Great shot Scott...or is that Great Scott.....shot!!

I've been doing a search on the size of N70 and haven't had any luck. How large is it Scott or is your final image here a non-resized crop of the full size image?

[avandonk]

Here is Scotts image on a widefield with Registar and without to show how faint the bubble is.

Bert

[[1ponders] (Paul)]

Ok, thanks Bert. It's a lot larger than I thought it would be.

Faint thought, 1 hr and 15 min with a modded Canon. :confuse: maybe 2 hrs to get a similar result with and unmodded one, maybe. Plus it's a 10" @ 5.6. An 8" @ 6.3 add maybe another half an hour plus to it (all best guestimates). Maybe one day

[Adrian-H]

wow thats cool.

its so faint, and its acctually quite large!

[beren]

Amazing image , along with Berts widefield To hand-guide for that amount time you must have the endurance of a shaolin monk

[tornado33]

Thanks everyone
Heres a shot taken of the LMC with Bert's 300 mm flourite lens a few months back, I was not happy I chopped N70 off bottom left
IS) 400, 4x6 mins F2.8, meteor through one of the shots.
Bert, your bigger sensor fits in the whole LMC area nicely with a 300mm lens.

Having the scope set up the night before is good too, all temperature equalized, and getting a few hours sleep helps with the guiding. Yes Im used to guiding long periods
Scott